cpu.h revision 4818 
1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * William Jolitz.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 *	from: @(#)cpu.h	5.4 (Berkeley) 5/9/91
37 *	$Id: cpu.h,v 1.16 1994/11/05 22:44:34 bde Exp $
38 */
39
40#ifndef _MACHINE_CPU_H_
41#define	_MACHINE_CPU_H_
42
43/*
44 * Definitions unique to i386 cpu support.
45 */
46#include <machine/frame.h>
47#include <machine/segments.h>
48
49/*
50 * definitions of cpu-dependent requirements
51 * referenced in generic code
52 */
53#undef	COPY_SIGCODE		/* don't copy sigcode above user stack in exec */
54
55#define	cpu_exec(p)	/* nothing */
56#define cpu_swapin(p)	/* nothing */
57#define cpu_setstack(p, ap)		(p)->p_md.md_regs = ap
58#define cpu_set_init_frame(p, fp)	(p)->p_md.md_regs = fp
59
60#define	CLKF_USERMODE(framep)	(ISPL((framep)->cf_cs) == SEL_UPL)
61#define CLKF_INTR(framep)	(0)
62#if 0
63/*
64 * XXX splsoftclock() is very broken and barely worth fixing.  It doesn't
65 * turn off the clock bit in imen or in the icu.  (This is not a serious
66 * problem at 100 Hz but it is serious at 16000 Hz for pcaudio.  softclock()
67 * can take more than 62.5 usec so clock interrupts are lost.)  It doesn't
68 * check for pending interrupts being unmasked.  clkintr() and Xintr0()
69 * assume that the ipl is high when hardclock() returns.  Our SWI_AST
70 * handling is efficient enough that little is gained by calling
71 * softclock() directly.
72 */
73#define	CLKF_BASEPRI(framep)	(((framep)->cf_ppl & ~SWI_AST_MASK) == 0)
74#else
75#define	CLKF_BASEPRI(framep)	(0)
76#endif
77#define	CLKF_PC(framep)		((framep)->cf_eip)
78
79/*
80 * Preempt the current process if in interrupt from user mode,
81 * or after the current trap/syscall if in system mode.
82 */
83#define	need_resched()	{ want_resched = 1; aston(); }
84
85/*
86 * Give a profiling tick to the current process from the softclock
87 * interrupt.  On tahoe, request an ast to send us through trap(),
88 * marking the proc as needing a profiling tick.
89 */
90#define	need_proftick(p)	{ (p)->p_flag |= P_OWEUPC; aston(); }
91
92/*
93 * Notify the current process (p) that it has a signal pending,
94 * process as soon as possible.
95 */
96#define	signotify(p)	aston()
97
98#define aston()	setsoftast()
99#define astoff()
100
101/*
102 * pull in #defines for kinds of processors
103 */
104#include <machine/cputypes.h>
105
106struct cpu_nameclass {
107	char *cpu_name;
108	int  cpu_class;
109};
110
111/*
112 * CTL_MACHDEP definitions.
113 */
114#define CPU_CONSDEV		1	/* dev_t: console terminal device */
115#define	CPU_ADJKERNTZ		2	/* int:	timezone offset	for resettodr()	*/
116#define	CPU_DISRTCSET		3	/* int:	disable	resettodr() call */
117#define CPU_MAXID               4       /* number of valid machdep ids */
118
119#define CTL_MACHDEP_NAMES { \
120	{ 0, 0 }, \
121	{ "console_device", CTLTYPE_STRUCT }, \
122	{ "adjkerntz", CTLTYPE_INT }, \
123	{ "disable_rtc_set", CTLTYPE_INT }, \
124}
125
126#ifdef KERNEL
127extern int	bootverbose;
128extern int	cpu;
129extern int	cpu_class;
130extern struct cpu_nameclass i386_cpus[];
131extern int	want_resched;	/* resched was called */
132
133int	cpu_fork __P((struct proc *, struct proc *));
134#endif
135
136#endif /* !_MACHINE_CPU_H_ */
137